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Regulatory Capital - Summary of Regulatory Capital Requirement (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 534,701 | $ 427,616
Total capital (to risk-weighted assets), Actual, Ratio | 13.53% | 13.39%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 316,157 | $ 255,419
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 414,956 | $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 10.50% | 9.875%
Tier 1 capital (to average assets), Actual, Amount | $ 516,692 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 13.07% | 12.83%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 237,196 | $ 191,565
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.00% | 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 336,028 | $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 8.50% | 7.875%
Common equity tier 1 capital, Actual Amount | $ 459,162 | $ 371,297
Common equity tier 1 capital, Actual Ratio | 11.61% | 11.63%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 177,970 | $ 143,673
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 4.50% | 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 276,842 | $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.00% | 6.375%
Tier 1 capital (to average assets), Actual, Amount | $ 516,692 | $ 409,760
Tier 1 capital (to average assets), Actual, Ratio | 10.51% | 10.12%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 196,648 | $ 162,033
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 196,648 | $ 162,033
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 4.00% | 4.00%
Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total capital (to risk-weighted assets), Actual, Amount | $ 477,150 | $ 396,755
Total capital (to risk-weighted assets), Actual, Ratio | 12.08% | 12.43%
Total capital (to risk-weighted assets), For capital adequacy purposes, Amount | $ 316,012 | $ 255,419
Total capital (to risk-weighted assets), For capital adequacy purposes, Ratio | 8.00% | 8.00%
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 414,765 | $ 315,283
Total capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 10.50% | 9.875%
Total capital (to risk-weighted assets), For well capitalized purpose, Amount | $ 395,015 | $ 319,274
Total capital (to risk-weighted assets), For well capitalized purpose, Ratio | 10.00% | 10.00%
Tier 1 capital (to average assets), Actual, Amount | $ 459,140 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 11.62% | 11.87%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 237,010 | $ 191,565
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 6.00% | 6.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 335,764 | $ 251,429
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 8.50% | 7.875%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 316,014 | $ 255,420
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 8.00% | 8.00%
Common equity tier 1 capital, Actual Amount | $ 459,140 | $ 378,899
Common equity tier 1 capital, Actual Ratio | 11.62% | 11.87%
Common equity tier 1 capital,For capital adequacy purposes, Amount | $ 177,758 | $ 143,674
Common equity tier 1 capital, For capital adequacy purpose, Ratio | 4.50% | 4.50%
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 276,512 | $ 203,537
Common equity tier 1 capital (to risk-weighted assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 7.00% | 6.375%
Common equity tier 1 capital, For well capitalized purpose, Amount | $ 256,761 | $ 207,528
Common equity tier 1 capital, For well capitalized purposes, Ratio | 6.50% | 6.50%
Tier 1 capital (to average assets), Actual, Amount | $ 459,140 | $ 378,899
Tier 1 capital (to average assets), Actual, Ratio | 9.35% | 9.34%
Tier 1 capital (to average assets), For capital adequacy purposes, Amount | $ 196,489 | $ 162,327
Tier 1 capital (to average assets), For capital adequacy purpose, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Amount | $ 196,489 | $ 162,327
Tier 1 capital (to average assets), Required for capital1 adequacy purposes with capital buffer, Ratio | 4.00% | 4.00%
Tier 1 capital (to average assets), For well capitalized purpose, Amount | $ 245,611 | $ 202,908
Tier 1 capital (to average assets), For well capitalized purposes, Ratio | 5.00% | 5.00%

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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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